Davenport-back



O. A. HONSINGER.

DAVENPORT BACK.

APPLICATION FILED JUNE 2,1920.

1,397,963, Patented Nov. 22, 1921. V S-SHEET Z- 2 SHEET Fig.2

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se ww w UNITED STATES PATENT OFFICE.

DAVENPORT-BACK.

Specification of Letters Patent.

Patented Nov. 22, 1921.

Application filed June 2, 1920. Serial No. 385,888.

To all whom it may concern.

Be it known that I, ORNAN A. HONSlNGER, a citizen of the United States of America, and resident of the city of Tacoma, in the county of Pierce and State of IVashington, have invented certain new and useful Improvements in Davenport-Backs, of which the following is a specification.

My invention relates to an improvement in davenport backs, and comprises particularly a means for raising and supporting clavenport backs.

The object of my invention is to provide a series of links arranged to support a davenport back so that it may be raised from what may be called the closed position and lifted out of the way for any purpose, for instance, for the purpose of unfolding a folding bed forming part of the davenport.

The principal object of the present invention is to provide such a series of links which will produce a nearly parallel motion of the back and which will raise it high enough and hold it in substantially a vertical position.

A further object of this invention is to provide means which are so positioned and so connected with respect to the link supports in raising or lowering that the parts will be automatically secured in either upraised or lowered position.

In the present drawings, wherein my invention is shown in its present preferred forms, Figure l is a section through the da-venport showing the parts in upraised position, only so much of the davenport frame and back being shown as is necessary for proper illustration.

Fig. 2 is a section just inside an end of the davenport frame, showing in full lines the parts in an intermediate position, and in dotted lines the parts in the loweredposition.

Figs. 3 and 4 are fragmentary elevations of two modified forms of latch.

In many davenports which are provided with swinging backs and with folding beds, it is difiicult to raise the davenport back sufiiciently to enable the bed to be opened out or to keep the davenport back upraised in a position where it will not be in the way of the sleeper or liable to be knocked down accidentally. In order that the back may be raised to a position where it will be entirely out of the way and where it will interfere the least with the use of the bed, suitable link supports, as shown in the drawings and as wall be hereinafter described, are employed. I prefer to secure a supporting angle-iron 1 to the back of the davenport frame 10, and to the davenport back 20 I may secure a thin strip of metal 2. These metal strips 1 and 2 form the foundation to which are secured the back supporting links. These metal strips 1 and 2 in reality are a part of my link construction, although the one is fixed to the davenport frame and the other to the davenport back.

A long link 3 is pivoted at 13 to the angle iron 1 and at 23 to the strip 2. Spaced from this link 3 are a pair of links 4 and 5. The link 4 is pivoted at 14 to the strip 1 and the link 5 is pivoted at 25 to the strip 2. Between the ends of the link 3, as at 36, is pivoted a link 6. This link 6 at one end is pivoted, as at 65, to an end of the link 5 and between the ends of the link 6 the link 4 is pivoted, as at 64.

The construction described above forms a series of links which are arranged roughly in two quadrilaterals in which the link 6 forms a side common to both of the quadrilaterals. The construction might also be described as modified lazy tongs in which the link 4, instead of being an integral downward extension of the link 6, is secured as described. This construction forms a pair of toggle joints, one between the links 5 and 6 and the other between the links 2 and 3.

In raising the back the first toggle joint, that between the links 5 and 6, gradually straightens out until in the uppermost position the two become alined. The toggle joint between the links 2 and 3 is not quite closed and thus the triangle formed by the links 2, 3, and 5 and 6 alined, supports the back in a vertical position as shown in Fig. 1. It will be seen that the length of the link 2 added to the distance between the pivots 36 and 23 of the link 3 must exceed the combined length of the links 5 and 6.

I prefer that the opposite sides of the quadrilateral formed by the links be of different lengths; thus the quadrilaterals as shown are trapezoids. By reason of this the motion of the back upward is not a truly parallel motion but it is raised from an inclined position, as shown in Fig. 2 in dotted lines, to substantially a vertical position as shown in Fig. 1. I

I provide a positive means for holding the back in upraised position. In my preferred construction this comprises a spring 8 secured to two relatively movable parts, as the davenport frame 1Oand the link 8. "This may be so positioned that it will also serve as a lock to keep the seat lowered. To accomplish this result the spring must come into alinement with or pass beyond the pivot 7 between the relatively movable parts, here the back has been raised slightly, enough to pass the spring across the pivot 13, the spring will assist in raising the back. If it is made sufficiently strong this spring will support the back in raised position.

As an alternative means of securing the parts in upraised position only, I may provide one or more latches '7, as shown in Fig.

i 3. This latch is provided with a notch or slot 70 and with an inclined or rounded surface 71. It is secured upon an angle 1. A pin 37 carried by one of the links, as 3, engages the curved surface 71 when the parts are near their uppermost limit and raises the latch 7 until the slot'TO drops over the' 'pin 37. The latch will then prevent downward movement of the parts until it is raised from engagement with the pin 37.

An alternative form of latch 7 is shown in Fig. 4. In this type the latch bar 7 is pivoted at 17 upon the angle '1. A toe 72, engaging the rear side of the angle, prevents "downward swing of the latch beyond the horizontal, but permits it to be raised when necessary. At its outer end the latch 7' is formed with a cam surface 71. which leads to a locking notch 70. The pin 37, as the link 3 rises, engages the surface 71 and raises the latch 7' until the pin drops into the notch 70. The links cannot then be lowered until the latch is released.

It is desirable that the sets of links at opposite ends of the davenport should work together. It is also desirable that the links 5 and 2 should never become exactly alined when in the lowered position, in order that the back may be raised by an upward pull uponits lower edge. Further I desire to providesomepositive stop for limiting the In order downwardmovement of the parts. to do thisI may provide a rod 51 which ex- 7 tends across from the link 5 at one end of the davenport to its companion link at the other end, and which is secured in each of the links .5.' In' the lowered position of the parts the bar 51 will contact with each of the.

links 6 and this will prevent further down ward movement of the parts.

What I claim as my invention is:

1. A support for davenport backs comprising a plurality of links forming, in positions between their upper and lower positions, two quadrilaterals, one of the links in one quadrilateral being secured to the davenport back, and a link in the second quadrilateral being secured to the davenport frame. V

2. A upport for davenport backs comprising a plurality of links forming, in positions between their upper and lower positions, two quadrilaterals having one link forminga side common to both, one side of one quadrilateral being secured to the davenport back and oneside of the other quadrilateral being secured to the davenport frame.

8. A support for davenport backs comprising two quadrilateral sets of links having one link forming a common side, opposite links in each series being unequal, one

link'in one quadrilateral being secured to the davenport back, and a hnk in the other quadrilateral being secured to the davenport frame.

41A support for davenport backs com prising a plurality of links forming,in positions between their upper and lower positions, two quadrilaterals each having one side formed by a common link, the link'opposite the common link in the outer quadri-' lateral beingsecured to the davenport back, and the link opposite the common link in the inner quadrilateral being secured to the davenport frame, and a lateral link in the outer quadrilateral lying substantially in alinement with said common link when the back is in raised position to support the back.

5. A support for davenport backs comprising a link pivoted to the davenport frame and tothe davenport back, a pair of links spaced therefrom and pivoted -respec-' tively upon said frame and saidback, and a fourth link pivoted upon saidfirstlink between its ends, and to the end of one of said pair of links, the other link of the pair tween its ends, and to .the end of one of saidpair of links, the other link of the pair be ing pivoted to said fourth link intermediate its ends, and an extension spring having its ends secured to two relatively movable parts, and operable to hold said back in upraised position. i

7. A support for davenport backs comprising a link pivoted to the davenport frame and to the davenport back, a pair of link spaced thereabove and pivoted respectively upon said frame and said back, and a fourth link pivoted upon said first link between its ends, and pivoted upon the end of that one of said pair of links which is pivoted upon the back, that one of the pair of links which is pivoted upon the frame being pivoted upon said fourth link between its ends.

8. A support for davenport backs comprising a link pivoted to the davenport frame and to the davenport back, a pair of links spaced thereabove and pivoted respectively upon said frame and said back, and a fourth link pivoted upon said first link between its ends, and pivoted upon the end of that one of said pair of links which is pivoted upon the back, that one of the pair of links which is pivoted upon the frame being pivoted upon said fourth link between its ends, the total length of said fourth link and the short link pivoted upon the back being less than the total length of the first link between its pivot upon the back and the pivot of the fourth link added to the distance between the pivots of the links upon the back.

9. A support for davenport backs comprising a link pivoted to the davenport frame midway between the upper and lower edges of the davenport back in its lowered position, and pivoted to the lower edge of the davenport back, and a plurality of extension links pivoted to said frame, said back, and said link, and adapted to support the upper portion of the back.

10. A support for davenport backs comprising a plurality of links forming, in positions between their upper and lower positions, two quadrilaterals each having one side formed by a common link, the link in the outer quadrilateral being secured to the davenport back, and the link opposite said common link in the inner quadrilateral being secured to the davenport frame, the upper lateral link in the outer quadrilateral lying substantially in alinement with said common link when the back is in raised position to support the back, and lying nearly in alinement with the link which is secured to the back when in lowered position, and a stop limiting the downward movement of the parts to prevent said links from becoming alined.

11. A support for davenport backs comprising links for swinging said back into upraised and lowered positions, including a link pivoted to the davenport frame and back, an arm secured rigidly to said link between its pivotal points and extending rearwardly toward the frame beyond the pivot of said link thereon when the back is in its lowered position, and a spring secured to said frame and to the rear end of said arm, and movable past a neutral position as the back swings between its extreme positions.

12. A support for davenport backs comprising a link pivoted to the davenport frame above the lower edge of the davenport back in its lowered position, and pivoted to the lower edge of the davenport back, and a plurality of extension links pivoted to said frame, said back, and said link, and adapted to support the upper portion of the back.

13. A support for davenport backs comprising a link pivoted to the davenport frame above the lower edge of the davenport back in its lowered position, and pivoted to the lower edge of the davenport back, and a plurality of extension links pivoted to said frame, said back, and said link, and adapted to support the upper portion of the back, and a spring secured to said frame and to said first link between its pivotal points, and movable past a neutral position as the back moves between its extreme positions.

14. A support for davenport backs comprising a link pivoted to the davenport frame above the lower edge of the davenport back in its lowered position, and pivoted to the lower edge of the davenport back, and a plurality of extension links pivoted to said frame, said back, and said link, and adapted to support the upper portion of the back, an arm rigidly secured to said first link between its pivotal points, and extending rearwardly toward the frame beyond the pivot of said link thereon when the back is in its lowered position, and a spring secured to said frame and to the rear end of said arm, and movable past a neutral position as the back moves between its extreme positions.

15. A support for davenport backs comprising a link pivoted to the davenport frame above the lower edge of the davenport back in its lowered position, and pivoted to the lower edge of the back, and a plurality of extension links pivotedto said frame, said back, and said link, and adapted to support the upper portion of the back, two of said links being alined when the back is upraised, and a third acting to brace the two alined links.

Signed at Seattle, King county, Washington this 27th day of May, 1920.

ORNAN A. HONSINGER.

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